Results 131 to 140 of about 745 (180)
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Asphaltene Flocculation, Precipitation, and Liesegang Ring
Energy & Fuels, 2004Precipitations of Ratawi and Kuparuk asphaltene in toluene/heptane mixed solvents were investigated using a newly developed dripping test method.
Fabricio Arteaga-Larios +2 more
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Asphaltene Precipitation from Live Crude Oil
Energy & Fuels, 2001Asphaltene precipitation from live crude oils that occurs due to pressure reduction can foul and clog oil production equipment, at the well surface, in the borehole, and even in the subsurface formation, thus is of considerable interest to oil operating companies.
Nikhil B. Joshi +4 more
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Hysteresis in Asphaltene Precipitation and Redissolution
Energy & Fuels, 2005The precipitation and redissolution of asphaltenes from mixtures of Athabasca bitumen and n-heptane was measured over time in both air and nitrogen atmospheres at 23 °C. In air, it appears that oxidation of the bitumen increased the asphaltene yield for as long as the experiments were conducted; that is, for several months.
J. Beck, W. Y. Svrcek, H. W. Yarranton
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Minimizing Asphaltene Precipitation in Malaysian Reservoir
SPE Saudi Arabia Section Technical Symposium and Exhibition, 2013Abstract Unstable Asphaltene is major concern in oil reservoir under CO2 Water alternating Gas injection due to its unrecoverable damage to reservoir and expensive treatments for production system. Therefore, the effective strategy to control Asphaltene precipitation should be the part of reservoir management. Dealing unstable Asphaltene
Muhammad Ali Buriro +1 more
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Asphaltene Precipitation During Different Production Operations
Petroleum Science and Technology, 2014Asphaltene precipitation due to enhanced oil recovery (EOR) methods or natural depletion is a serious technical problem at petroleum industry. The authors present the result of asphaltene precipitation during associated gas injection, CO2 injection, and natural depletion in reservoir condition.
M. A. Karambeigi, R. Kharrat
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Formation Damage by CO2-Induced Asphaltene Precipitation
SPE International Symposium and Exhibition on Formation Damage Control, 2006Abstract To increase productivity from crude oil reservoirs, carbondioxide (CO2) is usually injected during secondary and/or tertiary recovery. While CO2 injection significantly increases the amount of oil recovered, it causes asphaltene deposition at high concentrations.
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Improved thermodynamic investigation of asphaltene precipitation
2023Asphaltenes are analogous to the “cholesterol” of crude oils, so they may cause significant flow assurance problems to various oil and gas processes and negatively affect the economy of the oil recovery, transportation, and processing by increasing operational expenditures (OPEX). Asphaltenes increase oil viscosity, decrease its market value, and, when
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Asphaltene Precipitation During Acid Stimulation Treatments
Proceedings of SPE Formation Damage Control Symposium, 1986ABSTRACT Iron contaminated acid has recently been found to promote the precipitation of asphaltenes when acidizing certain oil bearing zones. This can cause severe formation damage. Standard anti-sludging agents, normally used to prevent this, are no longer effective in the presence of iron. Commonly used iron sequesterants are found not
I. C. Jacobs, M. A. Thorne
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Selective Asphaltene Precipitation from Hydroconverted Bottoms
Energy & Fuels, 2016A novel method is described that selectively precipitates the least soluble asphaltenic material from hydroconverted bottoms (HCB) using a dual immiscible solvent approach. This approach separates asphaltenes from the deasphalted (DAO)/precipitant layer by adding acetonitrile (CH3CN) as a second immiscible phase.
Jeramie J. Adams +6 more
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Thermodynamic modelling of asphaltene precipitation and related phenomena
Advances in Colloid and Interface Science, 2015Asphaltenes are considered to be the heaviest and most polar fractions of crude oils and are frequently implicated in problems encountered during production and refining as a result of phase separation. In recent years, considerable effort has been given to understanding the phase behaviour of these structurally heterogeneous materials from both ...
Forte, E, Taylor, SE
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